Synergistic effects of ultraviolet light irradiation and high-oxygen modified atmosphere packaging on physiological quality, microbial growth and lignification metabolism of fresh-cut carrots
Li Li, Changbao Li, Jian Sun, Ming Xin, Ping Yi, Xuemei He, Jinfeng Sheng, Zhugui Zhou, Dongning Ling, Fengjin Zheng, Jiemin Li, Guoming Liu, Zhichun Li, Yayuan Tang, Ying Yang and Jie Tang
Postharvest Biology and Technology, Volume 173, March 2021, 111365
2021
บทคัดย่อ
The present study investigated influences of ultraviolet light C (UV-C; 2 kJ m−2) irradiation and high-oxygen modified atmosphere packaging (MAP; 80 % O2, 10 % CO2 and 10 % N2) on physiological quality, microbial growth and lignification metabolism of fresh-cut carrots. After 15-d cold storage, comparing with either treatment alone, the combination of UV-C irradiation and high-oxygen MAP (abbr. UV-C + MAP) more obviously inhibited firmness, weight loss, ascorbic acid, total carotenoid and γ-aminobutyric acid declines, reduced respiration and ethylene production rates as well as delayed bacterial growth. UV-C + MAP more strongly restrained whiteness index, total phenolic, lignin and malondialdehyde increases. Furthermore, UV-C + MAP treatment more efficiently retarded lignin synthesis by suppressing phenolic metabolism-related enzyme (phenylalanine ammonialyase, PAL; polyphenoloxidase, PPO; peroxidase, POD) activities and their gene (DcPAL; DcPPO; DcPOD) expressions. Above results indicated that UV-C + MAP exhibited synergistic effects in retaining physiological quality, delayed senescence process, reducing microbial growth, alleviating lignification degree, and lessened surface whitening. Therefore, UV-C + MAP could maintain overall quality and extend shelf-life during storage of fresh-cut carrots.